Grapes and raisins can cause kidney failure in dogs, and chocolate can cause heart attacks, coma and death, so these are two things that should never be given to dogs. The theobromine in chocolate is very high in purines, and they can damage your dog’s kidneys, and dogs are much less able to degrade purines than people. Chocolate also contains caffeine, which is also very harmful to a dog’s health. The purer the chocolate and the smaller the dog, the greater the chance of poisoning.
